Well iam using mods, but thatdoesnt make sense, if i break glass and than look to another block it still looks broken, also with ice glowstone and redstonelamps
Mod Edit:
Steps to Reproduce:
1. Go to adventure mode.
2. Start breaking glass without finishing or releasing your mouse and move it to another block.
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Start breaking glass in adventure mode and then move your mouse to another block.
thats right

Confirmed in 1.5 Pre-release.

Added screenshots for vanilla Minecraft.
Note: In the screenshots the mouse was moved to the Gold Ore in progress of breaking the glass block.
Added steps to reproduce in vanilla Minecraft.
Edit: Sorry for having rainy weather in my screenshots.
tested in snapshot and Prerelease, still this bug
Duplicate of MC-8472, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.

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Cannot reproduce.
Please provide better steps to reproduce in vanilla minecraft.